Spray 13 x 9-inch baking dish.,______,Flatten chicken breast; season with salt, pepper and garlic salt.,Mix Parmesan cheese and bread crumbs in a shallow dish.,Dip chicken in melted margarine, then roll in bread crumbs and cheese mixture. Place in baking dish.,Press leftover crumb and cheese mixture onto each piece of chicken.,Pour leftover margarine around chicken.,Bake about 25 to 30 minutes being careful not to burn. Edges will be brown.,Pour 1 can tomato sauce around chicken. Sprinkle 1 tablespoon oregano over it and make 4 balls of Mozzarella cheese; place 1 on each piece of chicken.,Pour last can of tomato sauce on chicken and cheese balls; sprinkle with last tablespoon of oregano.,Bake at 350° for about 35 to 45 minutes or until tender.,Serve sauce over spaghetti noodles and with a green salad.,Leftovers are great as subs.